You find that her footprints are suddenly gone, and not just hers, as more sets of footprints came from elsewhere and met in the same place before disappearing too. You decide to investigate the disappearance site, as something strange definitely happened there.
You look at the ground and trees around you looking for some sign, anything. Nothing seemed out of the ordinary, until she noticed a strange clear patch of slime at the exposed root of a very large tree near where the footprints disappeared. You followed these marks and went around the tree, where you found a small crevice. You turned on your flashlight and shined it into the crevice, and discovered an underground tunnel, which you imagined Sarah and whoever else had gone to that corner of the woods might have found.
After sending Marcia a message about the tunnel and its location in case you didn't come back, you decided to go down through the crevice. The entrance was very tight and you had a lot of trouble getting through, leaving your clothes not entirely crooked and dirty. Judging by how narrow the passageway was, you were pretty sure fuller men or women wouldn't be able to get through. Stopping the analysis of the entrance, you followed the tunnel, illuminating the passage with your flashlight. The underpass was a little steep, and it surprised you that after going down for about two minutes the dirt floor was replaced by a stone staircase, which was clearly not natural.
Continuing your way down the stairs you ended the descent in a corridor, which was lit by torches on its walls. Judging by the structure of the walls, floor, ceiling, and what were clearly doors in the walls, that place appeared to be the ruins of some ancient civilization that was buried deep below the city. You opened the first door on each side and looked inside, finding only windowless rooms with very old looking furniture, but there were several sets of clothes, stored there, clothes clearly from the present day, in addition to other personal belongings.
Looking ahead down the hall, you saw a red line on the floor, ceiling and walls, dividing the part you were in and the rest. There were some writings in an ancient language next to the line on the walls, which you didn't know what they said. You advanced and, as soon as you passed the red line, purple flames appeared out of nowhere, engulfing you. You were afraid, thinking that you had fallen into a trap and would not survive, but then you realized that the purple flames were not burning you, but were completely consuming your clothes and belongings that you were carrying. Now there was no turning back, you didn't even have to look for help because your cell phone and all your equipment had been destroyed by the purple flames.
Gathering your courage, you continued your way deeper and deeper into the ruins, opening the doors you found along the way, until you eventually found a room that had another door on the opposite wall and you could see a brighter light coming from the other side throught its crevices. When passing through this new door, you came across a huge hall, with several decorations that led you to identify the place as some kind of ancient temple. In this room there were people, some talking to each other and little to themselves, but everyone was naked. On the altar, floating above the ground, was a white orb that was the source of all illumination in the temple.
Looking around, looking to see if Sarah was among the people, you saw her heading towards the sphere of light on the altar and, when you reached her, she entered the sphere of light and disappeared.
You advanced into the sphere of light, no one feeling uncomfortable with your presence there, and tried to touch it, but as soon as you put your hand on it you found nothing solid and went in. You took your hand out of there and saw that it didn't look dangerous, but it was still good to be careful. You then slowly entered the sphere, getting smart to back off quickly if something bad happened, but nothing happened until you were fully inside.
Suddenly your body became very hot and you couldn't move anymore, even you couldn't even feel your body. The feeling disappeared after a few seconds when you ended up leaving the sphere of light, but you found yourself no longer in the temple, but in a strange place and where everyone who entered the sphere was transported to, and everyone who was there, including yourself, had been transformed into...